MAX11080 datasheet(26/27 Pages) MAXIM

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12-Channel, High-Voltage Battery-Pack

Fault Monitor

______________________________________________________________________________________

NUMBER

NAME

ACTION

EFFECT

Open (or Disconnected)

No effect.

AGND

Short to Pin 30

No effect.

Open (or Disconnected)

No effect.

AGND

Short to Pin 31

If pin TOPSEL is set high (VAA), it causes the short between VAA and AGND.

ALRML is low.

There is no effect if TOPSEL is set low.

Open (or Disconnected)

If the part is the topmost device in the daisy chain, the ALRML is set high as

the state of TOPSEL is low (internally pulled down).

There are no other effects as the state of the pin stays the same (both low).

TOPSEL

Short to Pin 32

No effect if TOPSEL is set low.

If TOPSEL is set high, it causes the short between VAA and AGND and ALRML

is low.

Open (or Disconnected)

No effect.

AGND

Short to Pin 33

No effect.

Open (or Disconnected)

No effect.

N.C.

Short to Pin 34

No effect.

Open (or Disconnected)

ALRMU is internally pulled up to VDDU. There is no effect to the topmost

device. Otherwise, the communication of the chain is broken and the alarm

signal from the parts close to the topmost device are not passed through.

Since ALRML is a reflection of ALRMU, the state of ALRML is high for the no-

alarm state.

ALRMU

Short to Pin 35

No effect for the topmost device. Otherwise, the communication of the chain is

broken and the alarm signal from the parts close to the topmost are not

passed through. Since ALRML is a reflection of ALRMU, the state of ALRML is

low for the no-alarm state.

Open (or Disconnected)

The ALRML goes high. VDDU floats down approximately 4V. (See Note 8.)

GNDU

Short to Pin 36

The ALRML is high. (See Note 8).

Open (or Disconnected)

ALRML goes high. HV is approximately 0.4V below DCIN. (See Note 8.)

VDDU

Short to Pin 37

ALRML goes high. VDDU is approximately 0.5V lower than GNDU.

(See Note 8.)

Open (or Disconnected)

ALRML goes high. VDDU and HV collapse.

CP-

Short to Pin 38

ALRML goes high. VDDU is approximately 0.5V lower than GNDU.

(See Note 8.)

CP+

Open (or Disconnected)

ALRML goes high. VDDU and HV collapse. (See Note 8.)

Table 4. FEMA Analysis (Note 5) (continued)

Note 5: If the cell voltage is within the monitor range, the heartbeat signal on the ALRML resumes once the fault condition is

removed.

Note 6: The voltage level of high is equal to VAA and low is equal to AGND.

Note 7: Even if the pin has internal pulldown, the pulldown is very weak and the pin should be tied to AGND for logic 0 setting.

Note 8: VDDU - GNDU = 3.3 - V and HV - DCIN = 3.6V for the typical configuration. When VDDU and HV collapse, VDDU - GNDU ≈

0 - V and HV - DCIN

≈ -0.4V.

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